package com.spzx.cart.service.impl;

import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.spzx.cart.api.domain.CartInfo;
import com.spzx.cart.service.ICartService;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.SkuPriceVo;
import com.spzx.product.api.domain.ProductSkuVo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class CartServiceImpl implements ICartService {
    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteProductService remoteProductService;
    private String getCartKey(Long userId) {
        //定义key user:userId:cart
        return "user:cart:" + userId;
    }

    @Override
    public void addToCart(Long skuId, Integer skuNum) {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        //1.构建“用户”购物车hash结构key  user:cart:用户ID
        String cartKey = getCartKey(userId);
        //2.创建Hash结构绑定操作对象（方便对hash进行操作）
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);
        //4.判断用户购物车中是否包含该商品 如果包含：数量进行累加(商品数量上限50) ：新增购物车商品
        String hashKey = skuId.toString();
        Integer threshold = 50;
        if (hashOps.hasKey(hashKey)) {
            //4.1 说明该商品在购物车中已有，对数量进行累加 ，不能超过指定上限50
            CartInfo cartInfo = hashOps.get(hashKey);
            Integer totalCount = cartInfo.getSkuNum() + skuNum;
            cartInfo.setSkuNum(totalCount > threshold ? threshold : totalCount);
            hashOps.put(hashKey, cartInfo);
        }else{
            //3.判断购物车商品种类（不同SKU）总数大于10件
            Long count = hashOps.size();
            if(++count > 10){
                throw new RuntimeException("购物车商品种类总数不得大于10件");
            }
            //4. 说明购物车没有该商品，构建购物车对象，存入Redis
            CartInfo cartInfo = new CartInfo();
            cartInfo.setSkuId(skuId);
            cartInfo.setSkuNum(skuNum>threshold ? threshold : skuNum);
            //4.1 远程调用商品服务获取商品sku基本信息
            R<ProductSkuVo> productSkuResult = remoteProductService.getProductSku(skuId, SecurityConstants.INNER);
            if (R.FAIL == productSkuResult.getCode()){
                throw new ServiceException("远程调用失败，失败原因:" + productSkuResult.getMsg());
            }
            ProductSkuVo productSku = productSkuResult.getData();
            cartInfo.setSkuId(skuId);
            cartInfo.setSkuName(productSku.getSkuName());
            cartInfo.setThumbImg(productSku.getThumbImg());
            cartInfo.setCartPrice(productSku.getSalePrice());
            cartInfo.setSkuPrice(productSku.getSalePrice());
            cartInfo.setCreateTime(new Date());
            //4.2 将购物车商品存入Redis
            hashOps.put(hashKey, cartInfo);
            }

    }

    @Override
    public void clearCart() {
        Long userId = SecurityContextHolder.getUserId();
        redisTemplate.delete(getCartKey(userId));

    }

    @Override
    public List<CartInfo> getCartList() {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String cartList = this.getCartKey(userId);
        // 获取数据
        List<CartInfo> values = redisTemplate.opsForHash().values(cartList);
        if (!CollectionUtils.isEmpty(values)){
            List<CartInfo> infoList = values.stream().sorted((o1, o2) -> o2.getCreateTime().compareTo(o1.getCreateTime()))
                    .collect(Collectors.toList());
            return infoList;
        }
        return new ArrayList<>();
    }

    @Override
    public void deleteCart(Long skuId) {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        //获取缓存对象
        BoundHashOperations<String, String, CartInfo> boundHashOperations = redisTemplate.boundHashOps(cartKey);
        boundHashOperations.delete(skuId.toString());
    }

    @Override
    public void checkCart(Long skuId, Integer isChecked) {
        Long userId = SecurityContextHolder.getUserId();
        // 修改缓存
        String cartKey = getCartKey(userId);
        BoundHashOperations<String, String, CartInfo> boundHashOperations = redisTemplate.boundHashOps(cartKey);
        // 先获取用户选择的商品
        if (boundHashOperations.hasKey(skuId.toString())){
            CartInfo cartInfo = boundHashOperations.get(skuId.toString());
            // cartInfoUpd 写回缓存
            cartInfo.setIsChecked(isChecked);
            // 更新缓存
            boundHashOperations.put(skuId.toString(),cartInfo);
        }
    }

    @Override
    public void allCheckCart(Integer isChecked) {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String, String, CartInfo> boundHashOperations = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> list = boundHashOperations.values();
        list.forEach(cartInfo -> {
            CartInfo cartInfoUpd = boundHashOperations.get(cartInfo.getSkuId().toString());
            cartInfoUpd.setIsChecked(isChecked);

            boundHashOperations.put(cartInfo.getSkuId().toString(),cartInfoUpd);
        });
    }

    @Override
    public List<CartInfo> getCartCheckedList() {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = this.getCartKey(userId);
        List<CartInfo> cartCachInfoList = redisTemplate.opsForHash().values(cartKey);
        List<CartInfo> cartInfoList = new ArrayList<>();
        if (!CollectionUtils.isEmpty(cartCachInfoList)) {

            cartInfoList = cartCachInfoList
                    .stream()
                    .filter(item -> item.getIsChecked().intValue() == 1)
                    .collect(Collectors.toList());
        }
        return cartInfoList;
    }

    @Override
    public Boolean updateCartPrice(Long userId) {
        String cartKey = this.getCartKey(userId);
        BoundHashOperations<String, String, CartInfo> boundHashOperations = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> cartInfoList = boundHashOperations.values();
        if (!CollectionUtils.isEmpty(cartInfoList)) {
            for (CartInfo cartInfo : cartInfoList){
                if (cartInfo.getIsChecked().intValue() == 1){
                    SkuPriceVo skuPriceVo = remoteProductService.getSkuPrice(cartInfo.getSkuId(), SecurityConstants.INNER).getData();
                    //放入购物车时价格
                    cartInfo.setCartPrice(cartInfo.getSkuPrice());
                    //实时价格
                    cartInfo.setCartPrice(skuPriceVo.getSalePrice());
                    boundHashOperations.put(cartInfo.getSkuId().toString(),cartInfo);
                }
            }
        }
        return true;
    }

    @Override
    public Boolean deleteCartCheckedList(Long userId) {
        String cartKey = getCartKey(userId);
        BoundHashOperations<String, String, CartInfo> hashOperations = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> cartCachInfoList = hashOperations.values();
        for (CartInfo cartInfo : cartCachInfoList){
            if (cartInfo.getIsChecked().intValue() == 1) {
                hashOperations.delete(cartInfo.getSkuId().toString());
            }
        }
        return true;
    }


}



